Signaling device for motor-vehicles



M.. TIBBETTS. SIGNALING DEVICEFOR MOTOR VEHICLES. APPLICATION FILEDFEB-18.1916.

,327, 12 Patented J an. 6, 1920.-

"IIIIIIIA'M4 Wii 27635 is accomplished by UNITED STATES PATENT OFFICE.

MILTON TIBBETTS, 0F DETROIT, MICHIGAN, ASSIGNOR T0 PACKARD MOTOR CARCOMPANY. OF DETROIT. MICHIGAN, A CORPORATION OF MICHIGAN.

SIGNALING DEVICE FOR MOTOR-VEHICI5ES Specification of Letters Patent.

Application filed February 18, 1916. Serial No. 79,077.

To all whom it may concern:

Be it known that I. MILTON Tmim'r'rs, a citizen of the l nited States.and resident of Detroit. \Vayne county. State ofMichigan. have inventedcertain new and useful Improvements in Signaling Devices for Motor-Vehicles. of which the following is a specitication.

This invention relates to horns ingdevices.

One of the objects of the invention is to provide a horn, preferably ofthe diaphragm type. with a rotary or other device for vibrating thediaphragm. a motor for operating the rotary device, and an adjustableconnection between the motor and the rotary device.

Another object of the invention is to provide a horn of the abovereferred to type, with an adjusting means for the rotary member that canbe operated without moving the motor as a whole. I

Another object of the invention is to provide a horn of the above typewith means to increase the degree of vibration of the diaphragm with thecontinued operation of the vibrating means. As shown, this objectutilizin the heat of the motor to increase the pressure of the rotarymember on the diaphragm.

Other objects of the invention and the novel features thereof willappear from the following description taken in connection with thedrawings which form a part of this specification. and in which Figure 1is a longitudinal sectional view through a horn embodying thisinvention:

Fig. 2 is a similar vew of part of a horn showing another form of theinvention; and Fig. 3 illustrates another form of adjustrotary member.

mg means for the Referring to the drawings. 10 represents a support uponwhich the resonator 11 of the horn is mounted. Immediately behind theresonator is a diaphragm 12, which is provided adjacent its center witha wear piece 13 of any suitable form.

Means for vibrating the diaphragm 12 are provided in the form of arotary member l-t which. as shown. revolves about an axis substantiallynormal to the diaphragm. The

or signalteeth 15 of the rotary member engage the wear piece 13 of. thediaphragm and cause the latter to vibrate. thus producing the desiredsound.

'ithin the support 10 is an electric motor indicated generally at 12.The support is formed with a pair of separated bearings 16 and 17 inwhich the hollow armature shaft 19 of the motor is mounted. As shown,the motor has a core 40. field coils 11, armature 18 on the shaft 19.commutators 13, and brushes 11. The various parts of the motor withinthe support 10 may be removed therefrom by removing the piece 20 whichforms the end of and is secured to the support 10 as by screws 21. Alsothere is a cap or cover 22 detaehably secured over the motor andsupport. being held on the support as by screws and being provided withsuitable openings for the binding posts 21 for the electric wires of themotor.

As shown in Fig. 1, the rotary member 1% is adapted to be driven fromthe motor 42 through a shaft 25 which is connected at its remote end 26to the armature shaft 19. Thus the shaft 25 passes directly through thehollow armature shaft 19 and the screw thread connection 27' between theshafts permits of ready adjustment axially of the shafts of one shaftrelative to the other. For making this adjustment, the outer end 28 ofthe armature shaft is made square or of hexagon form. so that a wrenchmay be used on it to hold it stationary while the shaft is turned in itwith a screw-driver or other suitable tool. A lock nut 29 secures theshafts in adjusted position. I

From the above described construction, it will be evident that the shaft25 and consequeutly the rotary member 14 to which it is secured. may beadjusted axially of the shaft relative to the diaphragm 12 andrelatively also to the motor 12 and its armature shaft 19. Thus therotary member 14 may be adjusted without in any way moving the motor 12.it being necessary only to remove the cover 22 to expose the outer endsof the shafts 25 and 19. I

In the form of the invention shown, the rod 25 is made of a rapidlyexpanding metal such as aluminum, so that by a continued operation ofthe motor, the heat generated within the latter will cause an expansionor lengthening of the rod 25 and a consequent increase of pressure ofthe rotary member on the diaphragm 12, thus increasing the degree ofvibration of the dia- .phragm and of course increasing the soundproduced.

Patented Jan. 6, 1920.

In the form of the invention shown in Fig. 2, the outer end of thesha'ft is in the form of a reentrant head which is interiorlyscrew-threaded to fit the external thread 31 of the armature shaft 19. Alook nut secures the shaft in adjusted position.

In the form of adjustment shown in Fig. 3, the outer end of the rod orshaft 25 is keyed to the armature shaft 19 as by the key 33, and a clampnut 34 forms an abutment for the extreme end of the rod 25 and isthreaded on the end of the armature shaft 19 to thereby adjust theoutward position of the shaft 25. A lock nut 35 holds the nut 3a inadjusted position.

Other forms and modifications of the invention may be made Withoutdeparting from the spirit orscope thereof.

Having thus described my invention, what I claim and desire to secure byLetters Patent is 1. In a horn, in combination, a diaphragm, a rotarymember adapted to vibrate the diaphragm, a motor having a hollowarmature shaft, a shaft on said rotary member extending through saidarmature shaft, and keyed thereto, and an adjusting nut connecting saidshafts and adapted to determine the relative positions of the twoshafts.

2. In a horn, in combination, a diaphragm,

a rotary member adapted to vibrate the diaphragm, a motor, means tooperate the rotary member from the motor, and means to increase thepressure of the rotary member on the diaphragm with the continuedoperation of the motor at a given speed.

3. In a horn, in combination, a diaphragm,

means for vibrating the diaphragm, and

means to increase the degree of vibration with the continued operationof the vibrating means at a given speed.

4. In a horn, in combination, a rotary member adapted to vibrate thediaphragm, a motor, means to operate the rotary member from the motor,and means within the motor to increase the pressure of the rotary memberon the diaphragm with the continued operation of the motor at a givenspeed.

5. In a horn, in combination, a diaphragm, a rotary member adapted tovibrate the diaphragm, a motor, means to operate the rotary member fromthe motor, and means utilizing the heat of the motor to increase thepressure of the rotary member on the diaphragm with the continuedoperation of the motor.

In testimony whereof I aflix my signature.

MILTON 'IIBBET'IS.

adiaphragm,"

